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Winter Activity of Earwigs with Special Focus on the Phenology of Chelidura Guentheri (Galvagni, 1994) (Dermaptera: Forficulidae)

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Winter Activity of Earwigs with Special Focus on the Phenology of Chelidura Guentheri (Galvagni, 1994) (Dermaptera: Forficulidae) NORTH-WESTERN JOURNAL OF ZOOLOGY 9 (2): 239-244 ©NwjZ, Oradea, Romania, 2013 Article No.: 131103 http://biozoojournals.3x.ro/nwjz/index.html Winter activity of earwigs with special focus on the phenology of Chelidura guentheri (Galvagni, 1994) (Dermaptera: Forficulidae) Agnieszka SOSZYŃSKA-MAJ and Radomir JASKUŁA Department of Invertebrate Zoology & Hydrobiology, University of Łódź, Banacha str. 12/16, 90-237 Łódź, Poland *Corresponding author, A. Soszyńska-Maj, E-mail: [email protected] Received: 13. February 2011 / Accepted: 13. September 2012 / Available online: 11. February 2013 / Printed: December 2013 Abstract. Winter activity of earwigs has not been intensively studied until now. This study provides the first systematic data on winter activity of Chelidura guentheri (Dermaptera: Forficulidae) and its habitat preferences during this period. Most of the specimens were collected during two winter seasons; 2000/2001 and 2001/2002. To detect Dermaptera activity on the ground and under snow cover pitfall traps were used, and to collect earwigs active on the snow surface Moerick’s traps were used. Three species of Dermaptera were collected during winter, also from under the snow: Chelidura guentheri, Forficula auricularia and Apterygida media. In the collected material, C. guentheri predominated, while the two other species were noted occasionally. The highest winter activity of earwigs was noted in beech forests, while the lowest was recorded in riparian forests. The results show that earwigs can be a significant element of subnivean invertebrate activity, but they appear on the snow surface only accidentally. The most abundant earwig was an omnivorous species, which may play a role in subnivean food chains. Key words: Dermaptera, earwig, winter phenology, habitat preferences, subnivean fauna, supranivean fauna. Introduction annual cycles of activities. In fact, depletion of snow cover in some regions can make the study of Most invertebrates are inactive during the winter this fauna extremely difficult. and spend this time in diapause as eggs, larvae or The winter period is unfavorable for most in- pupae, less often as an adult stage (Leather et al. vertebrates because of low temperatures and lim- 1993). However, some poikilothermic organisms ited available food resources. However, winter ac- can stay active in winter. Their activity during low tivity of certain insects and spiders, both on the temperatures is usually dependent on a snow snow (supranivean fauna) and under snow (sub- cover with a high insulation capacity. The soil and nivean fauna) is a well known phenomenon. Con- litter temperature can remain around zero even if cerning subnivean activity, spiders (Araneida), the air temperature is rather low (Aitchison 1974, springtails (Collembola), beetles (Coleoptera) and 2001). Thus the occurrence of snow cover during flies (Diptera) are the best studied groups (Renken the winter period plays an important role in the 1956, Ackefors 1964, Näsmark 1964, Merriam et al. biology and ecology of many different inverte- 1983, Itämies & Lindgren 1989, Łęgowski & Łoziń- brate groups. Certain specialized species have ski 1995, Aitchison 2001, Hågvar & Hågvar 2011, been observed mating and laying eggs during this Jaskuła & Soszyńska-Maj 2011). The typical su- period (Soszyńska & Durska 2002, Hågvar 2010). pranivean fauna includes mainly scorpionflies During the last years, global climate change (Mecoptera) and flies (Diptera), but many other has become an important scientific topic (Loarie et invertebrates can be observed active on the snow al. 2009). Its influence on animals, except some surface, e.g. spiders (Araneae), springtails (Col- vertebrate groups, has been poorly studied and lembola), beetles (Coleoptera), stoneflies (Plecop- hard to predict. Huntley (2007) presented the tera), bugs (Hemiptera), and even moths (Lepi- statement that the easiest detectable and earliest doptera) (Hågvar 1995, 2000, 2007, 2010, Soszyń- responses on climate change is an adjustment of ska & Durska 2002, Hågvar & Greve 2003, Soszyń- species phenology. Loarie et al. (2009) suggested ska 2004, Soszyńska-Maj 2008, Hågvar & Aakra there would be rearrangement of the current dis- 2006, Soszyńska-Maj & Buszko 2011). tribution of climatic conditions in this century. Chelidura guentheri (Galvagni, 1994) (Dermap- This is likely to impact upon the winter active in- tera: Forficulidae) is one of seven earwig species vertebrates, which are strongly dependent on reported from Poland (Liana 2007, Jaskuła et al. weather and snow cover. The winter active fauna 2011). This taxon was recently described after de- may be well suited for observing changes in their tailed revision of genus Cheridurella (=Chelidura) 240 A. Soszyńska-Maj & R. Jaskuła Figure 1. Study area with study sites marked: A,B,C1,D – pitfall traps in two winter periods (2000/2001 and 2001/2002), C2, E - pitfall traps and Moerick`s traps in winter period 2005/2006. (Galvagni 1994, 1997). Its ecology and phenology CC92] – mixed coniferous forest with fir (Abies alba), is poorly known. Typically only wide-distributed beech (Fagus sylvatica) and spruce (Picea abies); Wolbórka and common Dermaptera species or taxa of eco- [UTM: CC92] – riparian forest (Circeo-Alnetum) in Wol- bórka river valley. Two first sites as well as Górna nomical importance have been studied in detail Mrożyca [UTM: DC14] – marshy alder carr (Ribeso nigri- (Behura 1956, Lamb & Wellington 1975, Good Alnetum) and Dobieszków Range [UTM: DC04] – dry- 1982, Vancassel & Quris 1994, Kočárek 1998). Most ground forest (Tilio-Carpinetum) are localized in the data on phenology and ecology of European Der- Wzniesienia Łódzkie Landscape Park (Rąkowski et al. maptera reported in the literature were collected 2006). during the vegetation season (Kočárek 1998). Win- The main part of the material was collected using pit- ter activity of earwigs has not been intensively fall traps to catch earwigs active on the ground, even un- der snow cover, during two winter seasons 2000/2001 studied until now. Only Renken (1956) and Łę- and 2001/2002 in four nature reserves. The investigation gowski and Łoziński (1995) recorded these insects was a part of a large study of winter active invertebrates as active during the winter period and Soszyńska- of the Łódź Upland region. In every site, 10 traps were lo- Maj (2008) reported one species active on the snow cated in homogeneous habitat, with 4-5 m distance be- surface. tween them as proposed by Breymeyer (1961). Construc- The aim of this study was to present the first tion of the traps followed the methodology of Aitchison systematic data on winter activity of Dermaptera. (1974). They consisted of outer cup with a diameter of 85 mm and inner removable cup with small amount of eth- It includes the phenology of the recently described ylene glycol to preserve the animals. Roofs supported by Chelidura guentheri, as well as its habitat prefer- three legs protected traps against snow and rain. They ences during this period. were checked every two weeks from the end of Novem- ber to the beginning of April. Every time the inner cup with collected material was replaced by a new one. If Material and Methods snow cover was present, a hole was carefully dug through the snow without disturbing the subnivean space The study area is localized in the Łódź district, Central around the trap. Afterwards, the trap was covered again Poland (Fig. 1). Regular studies were conducted in four by the roof. When the snow was present, the snow cover nature reserves: Struga Dobieszkowska [UTM: DC04] – was replaced. natural part of Młynówka river valley, with springs, Additional records were collected from the winter of overgrown by riparian forest (Circaeo-Alnetum) and dry- 2005-2006 in two study sites: Dobieszków Range and ground forest (Tilio-Carpinetum); Parowy Janinowskie Górna Mrożyca. In addition to pitfall traps, Moerick’s [UTM: DC04] – beech wood (Luzulo pilosae-Fagetum) with traps – usually known as yellow traps – were used to numerous old beech (Fagus sylvatica); Molenda [UTM: check the snow surface activity (Moericke 1949). Pitfall Winter activity of Dermaptera 241 Figure 2. Average ambient temperature (°C) and snow depth (cm) during the two winters of 2000/2001 and 2001/2002. traps were constructed as mentioned above, while yellow auricularia was caught in dry-ground forest, mix traps were put on the ground (10 traps in every site). Af- forest and marshy alder carr, while A. media was ter larger snow falls, Moerick’s traps were removed from collected only in marshy alder carr. under the snow and placed on the snow cover. Detailed data of soil temperature and depth of the snow were measured every time traps were emptied. Me- Winter phenology of C. guentheri teorological data came from the local weather station In the dominant species, C. guentheri, females placed in the neighbourhood area of the sampling sites; (87,7%), males (11,5%) and larvae (0,8%) were this is presented in Figure 2. found. A total of 812 individuals were collected To estimate habitat associations and phenology of C. (737♀♀ 75♂♂), 350 specimens in 2000/2001 (325♀♀ guentheri only material from two winter seasons 25♂♂), and 462 specimens in 2001/2002 (412♀♀ 2000/2001 and 2001/2002 was used. 50♂♂). Specimens collected in winter 2005/2006 (108 individuals) were not included in phenologi- Results cal analysis as they were caught using a different, incomparable sampling method. Both sexes of C. Altogether, 951 specimens of three Dermaptera guentheri were active during the whole winter pe- species were collected during three winter sea- riods, from the beginning of December to the be- sons. Chelidura guentheri clearly predominated (920 ginning of April. In January and February they indv., 96,7%). Two other species, Forficula auricu- were active under snow (Fig. 3). The lowest activ- laria and Apterygida media were caught occasion- ity was observed in December-January (from none ally – respectively 26 (2,7%) and 5 individuals to 31 individuals per sample). In both winters the (0,6%). Only males of A. media were found, in F. activity was low in January, but increased in Feb- auricularia males predominated (86,4%) (Table 1).
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